Railway track circuits



June so; 1931.

H. L. BONE 1,812,192-

RAILWAY TRACK CIRCUITS Filed June 4, 1930 INVENTG'RI H- A. 5 pm 6,

Patented June 30,

UNITED-f STAT-ES SYLVANIA HERBERT L. BONE, or SWISSVALE, PENNSYLVANIA, Assrenon TO THE umon swrron & SIGNAL COMPANY; or swIssvALnrEnNsYLvAnm, A oonronn'rron or PENN-7 RAILWAY TRACK omonr'rs I Application filed June 4, 1930. seriai No. 459,224.

My invention relates to railway trackcircuits, and has for anobject the provision of means for reducing the time required for the release of the track relay armature when a train enters the associated section.

'I will describe one form of track circuit. embodying my invention, and will then point out the novel features thereof in claims.

The accompanying drawing is a diagrammatic view showing one form of track circuit embodying my invention.

Referring to the drawing, the reference characters 1 and 1 designate the track rails of a railway, which rails are dividedby insulated joints '2 to provide a track section The reference, character R designates a track relay having-an armature 5- pivotally mounted at 5 and biasedbygravityto its opening the armature.

, series with this winding The auxiliary open position wherein a front contact 6 is open. The relay includesa main winding 3 for closing the armature 5, and an auxiliary winding 4 for assisting the force of gravity in Themain winding 3 is connected across the rails of section A B,' a resistance 7 preferably being included in winding 4 is connected across the rails of section A-B in series with the usual source of track circuit currentC, which, as'here shown, is a battery. y

The main winding 3 preferably has a rela.

' tively highresistance and the auxiliary wind- 7 'ing l preferably has a relatively low resist-.

ance. The parts are'so proportioned that when the section AB is unoccupied, the force acting on the armature 5- due to, the main winding 3 is considerably greater than the sum of the force of gravity and the force acting on the armature due to theauxiliary winding 4. Under this condition armature 5 is closed, so that the front contact '6 is closed:

. When a train enters the section.AB,-'however, the wheels and axles will form a low resistance. shunt across'the mai'nwinding 3" and the resistance 7, so that the main windthecurrent flowing in the auxiliary winding .ing 3 will be substantially deenergized, and

4 will be materially increased. The action" of the winding 4 will assist the force of gravv ity in opening armature 5, with theresult that this armature will open .much more quickly than if the winding 4 wrenot provided.

I i The safety a quired for railw y track circuits is not affected by a track circuit embodying my invention, because the breakage of any 'wire or the failure of the sourceof current C, will result in the opening of-armature 5 due to the force of gravity.

Although Ihave herein shown and described only one form of track circuit em- Y bodying my invention, it is understood that various changes and modifications may be made therein withinthe scopeof the append; edclaims without departing from the spirit and scope of myinvention;

Having thus described my invention what I claim is 1. Iii-combination, a single insulatedtrack section, a relayjhaving an armature biased by. gravity to the open positionand a main wind- .ing. for closing said armature'as well "as an auxiliary winding for assistingthe force of gravity in'opening said armature, a'con'nec- 1 tion across, ther ailsof said section including 1 said main winding, and a second connection across therails of said'section including said" auxiliary windingand a source of current.

' 2. In combination,asingle insulated track sect on, a relay having an armature'biased by gravity to the open positionand a main winding for closing said armature as-well as 2 an auxiliary winding' for assisting the force. i of gravityin opening said armature, a conp nection across the railsof saidsection ineluding said main winding, and a second con- I nection across the rails of said section inf eluding said auxiliary of current 1n series.

windingsand asource'.

3. In combination, a single insulated track section, a relay having an armature biased by gravity to the open position and a main Winding for closing said armature as Well as 5 an auxiliary Winding for assisting the force of gravity in opening said armature a connection across the rails of said section including said main Winding and a resistance in series, and a second connect-ion across the 19 rails of said section including said auxiliary Winding and a source of current in series.

In testimony whereof I afliX my signature.

HERBERT L. BONE. 

